13results about How to "Delay thermal runaway" patented technology

The application discloses a kind of composite multifunctional lithium metal negative and its preparation method and application, it is related to lithium ion battery technical field.The preparation method of a kind of composite multifunctional lithium metal negative includes the following steps: lithiumophilic nanoparticle is added to N-methyl pyrrolidone solution, is fully dispersed and is coated on copper foil dry, obtain lithiumophilic nanoparticle layer;Lithium negative electrode surface is cleaned and preheating treatment;Lithiumophilic nanoparticle layer is transferred to lithium foil;Lithium foil is evaporated, and thin film is deposited on the surface of lithium foil base bed;Lithium foil after evaporation is cooled and solidified, and composite multifunctional lithium metal negative is obtained.The application solves the problem that lithium deposition is not uniform, causes dendrite growth, interface side reaction triggers irreversible loss, the structure performance of existing SEI layer is insufficient and material interface bonding force is weak.

The utility model provides a battery pack and an energy storage system, and relates to the technical field of energy storage. The battery pack comprises a battery box body, a plurality of battery modules, a first support, a second support and a third support, a battery bin is formed in the battery box body, the battery modules are located in the battery bin, and each battery module comprises a plurality of single batteries arranged in the first direction; wherein in the first direction, a support is arranged between every two adjacent battery modules and at least one of one end of each battery module and the other end of each battery module, a plurality of energy absorption grooves are formed in each support, and crushing guide grooves are formed in the groove walls of at least part of the energy absorption grooves, so that the buffering and vibration reduction performance of the battery pack is improved.

The invention relates to the technical field of lithium ion batteries, in particular to a battery diaphragm, a preparation method of the battery diaphragm and a lithium ion battery, and the battery diaphragm comprises a flexible film substrate, and a ceramic coating and a polydopamine coating which are sequentially arranged on the surface of the film substrate from inside to outside. According to the technical scheme, the ceramic coating and the polydopamine coating are compounded on the membrane substrate, so that the electrolyte affinity and the thermal stability of the battery diaphragm can be effectively improved, and the electrochemical performance and the use safety of a battery can be improved.

This invention belongs to the field of batteries, specifically a single-cell battery and a high-capacity battery, overcoming the technical difficulties of high cost and heavy weight in existing high-capacity batteries. The single-cell battery includes a casing, which is formed by an upper cover plate, a cylindrical body, and a lower cover plate. The upper cover plate, cylindrical body, and lower cover plate are all made of plastic, and their strengths are all P, where P1≤P≤P2. P1 represents the strength requirement of the casing during the formation stage and normal charge / discharge stages; P2 represents the strength requirement of the casing during thermal runaway. At least one of the upper cover plate, cylindrical body, and lower cover plate has a sub-tube segment, which communicates with the inner cavity of the casing. The high-capacity battery includes a pressure-bearing casing and single-cell batteries arranged within the pressure-bearing casing. Corresponding sub-tube segments in adjacent single-cell batteries are sealed and connected to form a shared pipeline. The single-cell battery of this invention is low in cost and lightweight, and the pressure-bearing casing meets the strength requirements of the casing during thermal runaway.

This invention belongs to the field of batteries, specifically a high-capacity battery assembly. It overcomes the technical challenges of high cost and heavy weight inherent in existing high-capacity batteries. The assembly includes a pressure-bearing casing and a high-capacity battery and heat exchange device located within the casing. The high-capacity battery comprises a shared pipeline and n individual cells arranged along the x-direction, with their internal cavities connected by the shared pipeline. Each individual cell has a plastic casing with a strength P, where P1 ≤ P ≤ P2. P1 represents the strength requirement of the casing during the formation stage and normal charge / discharge stages, while P2 represents the strength requirement during thermal runaway. The pressure-bearing casing has a vent connected to the shared pipeline. The heat exchange device is located at the top of the high-capacity battery, with the polarity terminals of each individual cell passing through it. Compared to finished battery cells, the individual cells of this invention offer advantages in terms of light weight and low cost.

The application relates to a preparation method of an artificially modified CEI material, and the preparation steps comprise the following steps: mixing polymer monomers, a crosslinking agent, an organic plasticizer, a lithium salt, a photoinitiator and a diluent to obtain a precursor solution; performing spin coating on the surface of a high-nickel ternary positive electrode, standing to make the precursor solution fully wet, using a purple light lamp to initiate polymerization, and performing vacuum drying to obtain a high-nickel ternary positive electrode with an artificially modified CEI layer. The artificially modified CEI material is prepared by in-situ polymerization reaction of polyethylene glycol diacrylate and a fluorine-substituted product of ethylene carbonate, is used for a lithium metal battery positive electrode, can effectively stabilize the electrode / electrolyte interface, inhibit electrolyte decomposition and transition metal dissolution, reduce the occurrence of side reactions, and improves the cycle stability of the lithium metal battery.

The application provides a kind of optical storage system cluster SOH equalization control method, device and electronic equipment, belong to energy storage technical field.The method includes determining the SOH average value and SOH standard deviation of the optical storage system cluster according to the SOH data of all energy storage subsystems, in the case where the SOH standard deviation is greater than or equal to a preset value, the SOH data of each energy storage subsystem is compared with the sum of the SOH average value and the SOH standard deviation, the corresponding power allocation strategy is determined according to the comparison result and the power allocation is carried out according to the power data.The application takes SOH standard deviation as a key decision indicator, dynamically switches the optical storage system cluster from "non-discriminatory working mode" to "differentiated protection mode", delays the decay rate of all energy storage subsystems, and prolongs the average life and discharge capacity of the entire cluster throughout the life cycle.

The invention discloses a cross-linked polyethylene insulated flame-retardant power cable applied to the field of cables, and the cable is provided with a plurality of flame-retardant daughters on each battery cell, so that the cable not only can play a role of a firewall when a fire occurs, but also can release flame-retardant liquid through a self-spraying flame-retardant bag to prevent the fire from spreading along the cable, so that the flame-retardant daughters can play a role of fire protection. In addition, the cable can also monitor the overheating stage of the cable before a fire disaster occurs, an alarm is given at the early stage of overheating, active defense is achieved, the multiple flame-retardant sub-bodies on each battery cell cool the cable through circularly flowing cooling liquid, and after the overheating area is monitored, the multiple flame-retardant sub-bodies are linked to enhance the cooling effect on the overheating area, so that the safety of the cable is improved, and the service life of the cable is prolonged. In addition, after a fire disaster occurs, the cooling liquid and the liquid flame retardant are mixed through the flame-retardant parent body and transmitted to the flame-retardant child body for flame retardance, fire spreading is effectively prevented, and precious time is gained for cutting off a power source.

This invention provides an immersion-type energy storage battery housing, belonging to the field of energy storage technology. It includes a cold plate housing, a lower shell, and a top cover. Coolant flows inside the cold plate housing, placing the battery cell modules and the immersion liquid within a closed cavity formed by the cold plate housing, lower shell, and top cover. The immersion liquid insulates the battery cell modules from oxygen. Through heat conduction, the coolant exchanges heat with the immersion liquid, thereby cooling the battery cell modules. This immersion-type energy storage battery housing provides a non-flowing immersion liquid while allowing the coolant to circulate. This avoids problems caused by immersion liquid flow, effectively reducing thermal runaway of the battery cell modules, lowering safety risks, maintaining consistent temperature of the battery cell modules, and extending the service life of the energy storage system.

This application provides a battery thermal management control method, apparatus, electronic device, and storage medium. The method acquires the cell temperature generated by Joule heating within the battery device and the surface temperature of the battery top cover. If a first difference between the surface temperature and the cell temperature is greater than a preset temperature threshold, the battery device is heated to increase its temperature, and the surface temperature is corrected based on a first temperature correction coefficient to make the first difference less than or equal to the preset temperature threshold. If a second difference between the cell temperature and the surface temperature is greater than the preset temperature threshold, the battery device is cooled by heat dissipation, and the surface temperature is corrected based on a second temperature correction coefficient to make the second difference less than or equal to the preset temperature threshold. By combining heating or heat dissipation with a temperature correction coefficient, temperature fluctuations are controlled within the preset threshold, effectively avoiding battery performance degradation caused by temperature deviations, minimizing the risk of localized overheating or overcooling of the cell, and reducing the probability of thermal runaway.

The application relates to a composite current collector based on ECI, a preparation method thereof and a lithium battery. The preparation method of the composite current collector comprises the following steps: mixing a high-molecular polymer, a first flame retardant and a compatibilizer, and then performing granulation to prepare composite granules; sequentially performing melt extrusion and flow casting on the composite granules to prepare a flow casting blank film; and sequentially performing first stretching, first setting, second stretching and second setting on the prepared flow casting blank film to prepare a high-molecular base film; the direction of the first stretching is perpendicular to the direction of the second stretching, the temperature of the second stretching is higher than that of the first stretching, and the temperature of the second setting is higher than that of the first setting; a flame-retardant layer is prepared on at least one side of the high-molecular base film to obtain an intermediate; a copper layer is prepared on at least one side of the intermediate to prepare the composite current collector. The application constructs an environment-controllable ECI safety control system, improves the flame-retardant safety performance of the composite current collector, meanwhile, excellent mechanical strength and flexibility are reserved, and the thermal safety performance of the lithium battery is effectively improved.

This invention belongs to the field of battery technology. It provides a lithium-manganese battery, its manufacturing method, and an electrical device. The positive electrode active material in the positive electrode sheet of the lithium-manganese battery includes manganese dioxide. The separator of the lithium-manganese battery includes a base film and a functional coating disposed on the base film. The functional coating includes a mixture of inorganic solid electrolyte and aramid fiber. By combining the solid electrolyte and aramid fiber to form the functional coating on the base film, on the one hand, more uniform positive and negative electrode interface contact can be provided, promoting efficient ion transport; on the other hand, the inorganic solid electrolyte is non-flammable, and combined with the high strength characteristics of aramid fiber, the separator formed after coating can significantly reduce the risk of thermal runaway or fire in the battery.